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Which of the following statements is true?

A) The number of electron shells in an atom is called the atomic number.
B) Boiling and melting points are chemical properties.
C) A molecule of oxygen can have atoms of carbon in it.
D) Elements are substances made of only one type of atom.

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quasarJose

Answer:

D) Elements are substances made of only one type of atom.

Explanation:

The only correct choice from the ones given is that "elements are substances made of only one type of atom".

Elements are distinct substances that cannot be split up into simpler substances. Such substances consists of only one kind of atom. There are over one hundred elements known to date.

  • Atomic number is the number of protons in an atom.
  • Boiling points and melting points are physical properties of a substances.
  • A molecule of oxygen is made up of only oxygen atoms that have been covalently bonded together.

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